John b



(No Model.)

J. B. ARCHER.

BOILER FURNAGE.

N0. 341,623. Patented May 1l, 1886.

UNITED STATES ,y PATENT OFFICE.

JOHNVB. ARCHER, OF WASHINGTON, DISTRICT CF COLUMBIA.

BOlLER-FURNAC E.

SPECIFICATION forming part of Letters Patent No. 341,623, dated May 11l1886 Application filed March 18.1885. Renewed November 19, |855. Sex-inlNo. 183,369. (No model.)

To @l-whom it may concern,.-

Be it` known that l, JOHN B. ARCHER, a citizen of the United States,residing at Washington, inthe District of Columbia, have inventedcertain new and useful Improvements in Boiler-Furnaces; and I do herebydeclare the following to be a full, clear, and exact de scription of theinvention, suoli as will enable others skilled in the art to which itappertains to make and use the same.

My invention relates to that class of boilerfurnaces in which the fuelemployed is gas or hydrocarbon vapor; and the nature thereof consists incertain novel constructions of parts hereinafter described and shown.

In the accompanying drawings, in which corresponding parts aredesignated by similar letters, Figure l is a longitudinal elevation,partially in section, of a boiler-furnace having my improvement appliedthereto. Fig. 2 is a transverse vertical section on the lines x m ofFig. l. Fig. 3 illustrates in detail a tile constructed of fire-brick orother refractory material, which is placed in the fire-box of thefurnace above the grate. -Figs. 4 and 5 illustrate the gas-burner.

The cylindrical flue-boiler A has upon its under side one or more curvedtiles, B, of firebrick or other refractory material, which are providedwith slots or receptacles for the upper ends of the posts or pillars C.These posts or pillars rest in holes formed in the flat tiles D, and areconstructed of some highly refractory material which will resist theaction of the dame and absorb and store up the heat generated bycombustion. The gas or vapor enters the fire-box of the furnaceimmediately above the grate E by the pipe F,f and the air to supportcombustion by the pipeH, and both of these pipes are provided withvalves or stopcocks to regulate or entirely shut off the i'low of thegas or air through them'. The grate E is arranged immediately below thepoint at which the gas or vapor enters the fire-boX,and upon it areplaced blocks or bricks constructed of fire brick, which are intended toabsorb a portion of the heat generated by the coinbustion of the gas.Above the point at which the gas enters the re-box is placed the U-shaped tile of fire-brick I, which is provided with holes upon its underside through which a portion of the air from the hot-air chamber K flowsdownward upon the gas. As the specitic gravity of the air is at equaltemperature superior to that of the gas, the effect of this constructionis to cause the former to sink through the latter and thus create anintimate intermixture of these fiuids and a very perfect combustion. Aprojecting shelf or arch, L, of tire-brick, is arranged immediatelyabove the U-shaped tile I, and with it forms a sinuous passage, throughwhich the fiatne passes to the flue M beneath the boiler. Branch pipes oand o', provided with stop-cocks or valves for regulating the gas, leadfrom the main gas-induction pipes F to the burner N and N', which aresupplied with the requisite amount of air to support the combustion ofthe gas from the air-heating chamber P, formed inthe furnace brick-work."lhe burner N is in this instance placed in front of the posts orpillars and the burner N in the rear thereof, and the jets R arearranged in an inclined direction.

The construction ofthe burner is best shown in Fig. 4, in which Odesignates the gas-pipe, having a series of jets, R and T, the air-pipeprovided with a 'number of cylindrical projections, U, which surroundand inclose the gas-jets in such a manner as to form annular passage forthe air. The air entering through the pipe H passes upward into thehot-air chamber K, which is formed by the partitionplate V, againstwhich the products of combustion impinge on their way to the smokestack,and thence downward through another hot-air chamber in front of thefire-box to the point at which the gas enters through an opening, Y,provided with a damper. By means of these dampers the amount of airwhich enters above and below the grate E may be accurately adj usted andregulated. The air passing downward through the perforations in the tileI and upward through the grate E and refractory material placed thereonmeets the gas or Vaporentering through the gas induction-pipelandpromotes its combustion. The ame thus generated sweeps in azigzagdirection through the sinuous fiue formed by the tile I and shelf orprojection L into the horizontal flue M beneath the boiler, and theproducts of combustion, traversing the whole IOO length of the latter,pass through the tubular return-nues in the boilers to the smoke-stack,impinging on their Way upon the partition plate V, and thus impartingheat to the airheating chamber K. The airl entering the heating-chamberT passes into the air-tubes YVZ, which are provided with dampers, andfrom claim to these features in the present application.

Having thus described my invention, I claim and desire to secure byLetters Patent- 1. rI`he combination of the burners NN', the tiles B andD, the posts, pillars, or blocks C,

and the boiler, as and for the purpose described.

2. The combination of the burners N N', the

tiles B and D, the posts C, the air-heating chamber, and the boiler, asandV for the purpose described.

3. The combination of the perforated tile I, Which admits the air abovethe gas, the gasinduction pipe F, and the grate upon which is placedrefractory material, as and for the purpose described.

4. The combination of the tile I, the gas-induction pipe, and the shelfor projection L, as and for the purpose described.

5. The combination of the air and gas-induction pipes and the boilerhaving an airheating chamber, H, as and for the purpose described.

In testimony whereof I aix my signature in presence of two Witnesses.

JOHN B. ARCHER.

Witnesses:

C. S. WHITMAN, C. FRED. KELLER.

